Pneumatic tire.



A. C. MATHER.

PNEUMATIC TIRE.

APPLICATIONFILED MAY19,1913.

Patented Mar. 23, 1915.

ALONZO C. MATHER, OF CHICAGO, ILLINOIS.

PNEUMATIC TIRE.

Specification of Letters Patent.

Patented Mar. 23, 1915,

Application filed may 19, 1913. Serial No. 768,546.

, To all whom it may concern specification.

My invention relates to pneumatic tires used on motor vehicles and theobjects of my improvements are first, to prevent blowouts; second, tosubstantially double the life of the tire; third, to provide an innerand outer casing of flexible material and prevent the creeping of theouter casing; fourth to provide means for drawing the outer casing inits entirety tightly over the inner casing; fifth, to make a cheap anddurable construction and other features to become apparent from thedescription to follow.

Heretofore pneumatic tires have been made comprising an inner or airtube and an outer casing to envelop the same. The

outer casing was made sufliciently strong and-heavy to resist theoutward pressure of air. within the inner tube even after considerablewear and deterioration, but eventually the tire would have what istermed a blowout if it is kept in service a suflicient length of time.Blowouts, especially during the time the motor vehicle is being drivenat a rapid rate, are very dangerous on account of the almost unavoidableaccident resulting therefrom by the vehicle skidding. By the use of myinvention the possibility of a blowout is substantially eliminated, theouter casing which gets all the wear from traction and exposure to theelements can be worn completely through and the inner casing whichresists the outward air pressure is entirely protected against wear fromtraction and exposure, to the elements.

My invention consists of providing, an outerlcasing to entirely envelopthe casing which contains the inner or air tube, and

means for retaining the said outer casing in proper position.

To describe my invention so that others versed in the art to which itpertains can make and use the same, I have illustrated it on theaccompanying sheet of drawing forming a part of this specification, inwhich Figure 1 is a cross sectional view of agtire embodying myinvention. .Fig. 2 is a fragmentary side elevation of the same and Fig.

3, is a perspective view showing a clamping means forming a part of myinvention.

Similar reference characters refer to similar parts throughout allviews. 1

The wheel felly is represented at 3 and the spokes at 4:. The peripheryof the felly 3 is provided with the usual clencher rim 5, to which theinner casing 6 is clenched in the usual way by inflating the inner tube7. The parts thus far described form no part of my invention and arepreferably of the standard make and size. An outer casing 8 of flexiblematerial is provided to fit snugly over the inner casing 6 .and has theusual clencher edges 9 which are arranged to fit into the hook shapedflanges 10 of the plates or rims 11 secured to the opposite sides of thefelly 3 by means of bolts 12. The. rims 11 are rings cut at one point toon the clencher edges 9 of the outer casing 8. The adjacent ends of therims 11 formed by cuttingithem are provided with means for pulling themtogether as for instance the screw bolt 13 passing through suitablelaterally extdiading" lugs 14 integral with the rims 11. fl

It will be seen that the outer casing 8 entirely covers the-inner casing6, thus only the outer casing 8 becomes worn and deteriorated fromcontact with the ground and the elements. The inner casing 6 is madesufliciently heavy and strong to easily resist the air pressure withinthe inner tube 7 so that if it does not become worn or deteriorated bycontact with the elements its life will be greatly prolonged. The innercasing 6 is practically entirely protected against wear by the outercasing which can be replaced by a new one as often as found necessary.The holes 15 in the rims 11 through which the bolts 12 pass are madeconsiderable larger than the bolts so as to permit the slight shiftingof the said rims when they are being drawn tightlytogether by means ofthe screw bolts 13.

Having thus fully described my invention edges of the outer casing, saidfiat rings provided with a plurality of elongated perforations,fastening devices'secured to the wheel felly and slidingly engaging insaid perforations to secure, said rings to the fell and permitcircumferential and radical movement of the rings with respect to thetelly and means for forcing said fiat rin s radically toward the centerof the wheel o pull the outer casing tightly over the said tire. l i

v, 2. In a device of the class described, a tire of an inherent stableshape, mounted on a wheel, an o'utercasing of flexible material fittedto envelop said tire, rings mounted on either side of the Wheel tellyengaging the edges of said casing, said rings deletes of? this patentmay he obtained ter subscribing witnesses this 17 five cents each, byaddressing the Commissioner of Patents,

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